We present a solution for the long standing problem concerning the
"chromospheric"behaviour of the Mn i 5395/5432 Ålines in
the solar spectrum using multi-line/multi-species NLTE modelling.
Using comprehensive spectral line formation modelling, we show that the Mn i
lines are very sensitive to optical pumping in a transition which overlaps with
Mg ii k. It therefore follows that one has to be careful with the choice
of lines as temperature indicators and for the determination of the Mn
abundances although on the other hand, due to the formation process of these
lines they may be useful as a solar and stellar activity diagnostic.

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